/*++
Copyright (c) 1991 Microsoft Corporation
Module Name:
llclib.c
Abstract:
This module includes some general purpose library routines
Contents:
SwapMemCpy
RemoveFromLinkList
LlcSleep
LlcInitUnicodeString
LlcFreeUnicodeString
Author:
Antti Saarenheimo (o-anttis) 20-MAY-1991
Revision History:
--*/
#include <llc.h>
#include <memory.h>
//
// This table is used to swap the bits within each byte.
// The bits are in a reverse order in the token-ring frame header.
// We must swap the bits in a ethernet frame header, when the header
// is copied to a user buffer.
//
UCHAR Swap[256] = {
0x00, 0x80, 0x40, 0xc0, 0x20, 0xa0, 0x60, 0xe0, 0x10, 0x90, 0x50, 0xd0, 0x30, 0xb0, 0x70, 0xf0,
0x08, 0x88, 0x48, 0xc8, 0x28, 0xa8, 0x68, 0xe8, 0x18, 0x98, 0x58, 0xd8, 0x38, 0xb8, 0x78, 0xf8,
0x04, 0x84, 0x44, 0xc4, 0x24, 0xa4, 0x64, 0xe4, 0x14, 0x94, 0x54, 0xd4, 0x34, 0xb4, 0x74, 0xf4,
0x0c, 0x8c, 0x4c, 0xcc, 0x2c, 0xac, 0x6c, 0xec, 0x1c, 0x9c, 0x5c, 0xdc, 0x3c, 0xbc, 0x7c, 0xfc,
0x02, 0x82, 0x42, 0xc2, 0x22, 0xa2, 0x62, 0xe2, 0x12, 0x92, 0x52, 0xd2, 0x32, 0xb2, 0x72, 0xf2,
0x0a, 0x8a, 0x4a, 0xca, 0x2a, 0xaa, 0x6a, 0xea, 0x1a, 0x9a, 0x5a, 0xda, 0x3a, 0xba, 0x7a, 0xfa,
0x06, 0x86, 0x46, 0xc6, 0x26, 0xa6, 0x66, 0xe6, 0x16, 0x96, 0x56, 0xd6, 0x36, 0xb6, 0x76, 0xf6,
0x0e, 0x8e, 0x4e, 0xce, 0x2e, 0xae, 0x6e, 0xee, 0x1e, 0x9e, 0x5e, 0xde, 0x3e, 0xbe, 0x7e, 0xfe,
0x01, 0x81, 0x41, 0xc1, 0x21, 0xa1, 0x61, 0xe1, 0x11, 0x91, 0x51, 0xd1, 0x31, 0xb1, 0x71, 0xf1,
0x09, 0x89, 0x49, 0xc9, 0x29, 0xa9, 0x69, 0xe9, 0x19, 0x99, 0x59, 0xd9, 0x39, 0xb9, 0x79, 0xf9,
0x05, 0x85, 0x45, 0xc5, 0x25, 0xa5, 0x65, 0xe5, 0x15, 0x95, 0x55, 0xd5, 0x35, 0xb5, 0x75, 0xf5,
0x0d, 0x8d, 0x4d, 0xcd, 0x2d, 0xad, 0x6d, 0xed, 0x1d, 0x9d, 0x5d, 0xdd, 0x3d, 0xbd, 0x7d, 0xfd,
0x03, 0x83, 0x43, 0xc3, 0x23, 0xa3, 0x63, 0xe3, 0x13, 0x93, 0x53, 0xd3, 0x33, 0xb3, 0x73, 0xf3,
0x0b, 0x8b, 0x4b, 0xcb, 0x2b, 0xab, 0x6b, 0xeb, 0x1b, 0x9b, 0x5b, 0xdb, 0x3b, 0xbb, 0x7b, 0xfb,
0x07, 0x87, 0x47, 0xc7, 0x27, 0xa7, 0x67, 0xe7, 0x17, 0x97, 0x57, 0xd7, 0x37, 0xb7, 0x77, 0xf7,
0x0f, 0x8f, 0x4f, 0xcf, 0x2f, 0xaf, 0x6f, 0xef, 0x1f, 0x9f, 0x5f, 0xdf, 0x3f, 0xbf, 0x7f, 0xff
};
VOID
SwapMemCpy(
IN BOOLEAN boolSwapBytes,
IN PUCHAR pDest,
IN PUCHAR pSrc,
IN UINT Len
)
/*++
Routine Description:
conditionally swaps the bits within the copied bytes.
Arguments:
boolSwapBytes - TRUE if bytes are to be bit-swapped
pDest - where to copy to
pSrc - where to copy from
Len - number of bytes to copy
Return Value:
None.
--*/
{
if (boolSwapBytes) {
SwappingMemCpy(pDest, pSrc, Len);
} else {
LlcMemCpy(pDest, pSrc, Len);
}
}
VOID
RemoveFromLinkList(
IN OUT PVOID* ppBase,
IN PVOID pElement
)
/*++
Routine Description:
Searches and removes the given element from a single-entry link list.
ASSUMES: the link points to the link field in the next object
Arguments:
ppBase - pointer to pointer to queue
pElement - pointer to element to remove from queue
Return Value:
None.
--*/
{
for (; (PQUEUE_PACKET)*ppBase; ppBase = (PVOID*)&(((PQUEUE_PACKET)*ppBase)->pNext)) {
if (*ppBase == pElement) {
*ppBase = ((PQUEUE_PACKET)pElement)->pNext;
#if LLC_DBG
((PQUEUE_PACKET)pElement)->pNext = NULL;
#endif
break;
}
}
}
VOID
LlcSleep(
IN LONG lMicroSeconds
)
/*++
Routine Description:
Suspends thread execution for a short time
Arguments:
lMicroSeconds - number of microseconds to wait
Return Value:
None.
--*/
{
TIME t;
t.LowTime = -(lMicroSeconds * 10);
t.HighTime = -1;
KeDelayExecutionThread(UserMode, FALSE, &t);
}
DLC_STATUS
LlcInitUnicodeString(
OUT PUNICODE_STRING pStringDest,
IN PUNICODE_STRING pStringSrc
)
/*++
Routine Description:
initialize a UNICODE_STRING
Arguments:
pStringDest - pointer to UNICODE_STRING structure to initialize
pStringSrc - pointer to UNICODE_STRING structure containing valid string
Return Value:
DLC_STATUS
Success - STATUS_SUCCESS
Failure - DLC_STATUS_NO_MEMORY
Couldn't allocate memory from non-paged pool
--*/
{
pStringDest->MaximumLength = (USHORT)(pStringSrc->Length + sizeof(WCHAR));
pStringDest->Buffer = ALLOCATE_STRING_DRIVER(pStringDest->MaximumLength);
if (pStringDest->Buffer == NULL) {
return DLC_STATUS_NO_MEMORY;
} else {
RtlCopyUnicodeString(pStringDest, pStringSrc);
return STATUS_SUCCESS;
}
}
VOID
LlcFreeUnicodeString(
IN PUNICODE_STRING UnicodeString
)
/*++
Routine Description:
Companion routine to LlcInitUnicodeString - frees memory allocated from
non-paged pool for a UNICODE string
Arguments:
UnicodeString - pointer to UNICODE_STRING structure, the buffer for which
was allocated in LlcInitUnicodeString
Return Value:
None.
--*/
{
FREE_STRING_DRIVER(UnicodeString->Buffer);
}
//#if LLC_DBG
//
//VOID
//LlcInvalidObjectType( VOID )
//{
// DbgPrint( "DLC: Invalid object type!\n");
// DbgBreakPoint();
//}
//
//
//VOID LlcBreakListCorrupt( VOID )
//{
// DbgPrint( "Link list is corrupt! ");
// DbgBreakPoint();
//}
//
//static PUCHAR aLanLlcInputStrings[] = {
// "DISC0",
// "DISC1",
// "DM0",
// "DM1",
// "FRMR0",
// "FRMR1",
// "SABME0",
// "SABME1",
// "UA0",
// "UA1",
// "IS_I_r0",
// "IS_I_r1",
// "IS_I_c0",
// "IS_I_c1",
// "OS_I_r0",
// "OS_I_r1",
// "OS_I_c0",
// "OS_I_c1",
// "REJ_r0",
// "REJ_r1",
// "REJ_c0",
// "REJ_c1",
// "RNR_r0",
// "RNR_r1",
// "RNR_c0",
// "RNR_c1",
// "RR_r0",
// "RR_r1",
// "RR_c0",
// "RR_c1",
// "LPDU_INVALID_r0",
// "LPDU_INVALID_r1",
// "LPDU_INVALID_c0",
// "LPDU_INVALID_c1",
// "ACTIVATE_LS",
// "DEACTIVATE_LS",
// "ENTER_LCL_Busy",
// "EXIT_LCL_Busy",
// "SEND_I_POLL",
// "SET_ABME",
// "SET_ADM",
// "Ti_Expired",
// "T1_Expired",
// "T2_Expired"
//};
//
////
//// Procedure prints the last global inputs and time stamps. This
//// does not print the stamps of a specific link station!!!
////
//VOID
//PrintLastInputs(
// IN PUCHAR pszMessage,
// IN PDATA_LINK pLink
// )
//{
// UINT i;
// UINT j = 0;
//
// DbgPrint( pszMessage );
//
// //
// // Print 20 last time stamps and state inputs of the given
// // link station.
// //
// for (i = InputIndex - 1; i > InputIndex - LLC_INPUT_TABLE_SIZE; i--)
// {
// if (aLast[ i % LLC_INPUT_TABLE_SIZE ].pLink == pLink)
// {
// DbgPrint(
// "%4x:%10s, ",
// aLast[i % LLC_INPUT_TABLE_SIZE].Time,
// aLanLlcInputStrings[ aLast[i % LLC_INPUT_TABLE_SIZE].Input]
// );
// j++;
// if ((j % 4) == 0)
// {
// DbgPrint( "\n" );
// }
// if (j == 20)
// {
// break;
// }
// }
// }
//}
//#endif